I am not as eager to fight about the relative merits of the MacOS as you are. I have given my advice. You give yours.
My understanding is that Windows takes 2GB of RAM to run comfortably. I assume the computer you are looking for is for school work with no high demand programs like video processing or gaming otherwise 4GB of RAM would be better and for these programs a better video card is better then what you'll find on a Netbook which uses a minimal video card and shares the same RAM as the cpu. Dedicated video cards found on more expensive laptops have more power and their own dedicated memory. Something to consider depending on what the computer will be used for. If your child has any interest in computer related graphics, I would steer them away from a Netbook. If you decide to consider a regular laptop, for the sake of an informed decision, it would be good to make a PC-Mac laptop comparison of features.
If you want to run Windows 7 on your PC, here's what it takes:
- 1 gigahertz (GHz) or faster 32-bit (x86) or 64-bit (x64) processor
- 1 gigabyte (GB) RAM (32-bit) or 2 GB RAM (64-bit)
- 16 GB available hard disk space (32-bit) or 20 GB (64-bit)
- DirectX 9 graphics device with WDDM 1.0 or higher driver
http://windows.microsoft.com/systemrequirements